Cyanotypes
How Make a Cyanotype Print . ..
This show the process for applying emulsion, exposing the print, and developing the Cyanotype in plain water.
Tea Toning Cyanotype Prints
Once you make a Cyanotype print, you can then soak it in strong black tea and turn the blue into a sepia to brown value gradation because of the chemical reaction between the Cyanotype chemical and the tannin in the tea.
How to Tone a Cyanotype with Coffee
Using very strong coffee, you can make a Cyanotype from one of your digital negatives look very old.